Can't Open App Store or Windows/Start Button on Windows 10

Can't Open App Store or Windows/Start Button on Windows 10

Hey, all!
So, I just updated to Windows 10 today, and I'm having some problems.
1) I click on the Windows/Start button on my desktop... and nothing happens. What's up with this and how can I fix it?
2) I can't open the App Store. It will not open from the button on the little tray on the bottom, it just flashes an outline of a window and then it closes itself. I did a little more exploring, and I somehow got to a Settings app and tried accessing the store from changing one of the default apps on the Default Apps tab. It threw up an error message at me, saying something about how the process was illegal because a registry key was marked or something. WTF?
I have Avast! and Malwarebytes installed, and as I've been exploring around, I've seen that anti-virus programs have been the cause of a number of problems. Is there any way I can stop the problems without wiping out my protection?
Thanks for your help, if you can give it!

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So, update - the app store works now, after I restarted, but the start button still does nothing when I click it.
Extra update - tried downloading an app, but it is doing nothing but flashing a window outline, then nothing.

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All righty, so latest update (can I please get some help here?): Just ran the latest Windows update, which fixed nothing in regards to this. I've stumbled upon the possibility that I might need to make a new user profile because my current one may be corrupted. So, I've tried to do that through the Settings, but when I click the button to add a new user account or log in to my Microsoft account, nothing happens. HELP ME.

My ComputerYou need to have JavaScript enabled so that you can use this ...

All righty, so latest update (can I please get some help here?): Just ran the latest Windows update, which fixed nothing in regards to this. I've stumbled upon the possibility that I might need to make a new user profile because my current one may be corrupted. So, I've tried to do that through the Settings, but when I click the button to add a new user account or log in to my Microsoft account, nothing happens. HELP ME.

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